WWTT??? - Shake to Undo??? Part 2

(Continued from Yesterday...)

Excited, he told her "I solved the problem of Undo - I know how we can easily add Undo the iPhone OS, and in a cool great way!"

"How?" asked his manager, slightly excited.

"You know, how the iPhone is like a fun-electronic-drawing-board, effectively a cool-expensive-small-Etch-n-Sketch?"

"Yes", answered the weary manager, bleary-eyed after days (and nights) of staring at screens with numbers and charts and sketches.